MP4060GS datasheet(21/25 Pages) MPS

21 / 25 page

MP4060—TRIAC Dimmable PFC, PSC LED Controller for 200-265VAC LEDs

MP4060 Rev. 1.0

www.MonolithicPower.com

5/27/2015

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

If the leading-edge dimmer is detected, the

dimming pull-down current source turns on when

MULT decreases to VMULT_DP_ON_LD, and it turns off

when MULT increases to VMULT_DP_OFF_LD. If the

trailing-edge dimmer is detected, the dimming

pull-down current source turns on when MULT

decreases to VMULT_DP_ON_TL, and it turns off when

MULT increases to VMULT_DP_OFF_TL.

The weak/strong dimming pull-down current

sources

are

selected

through

different

resistances on ZCD. Figure 17 shows the

selected logic:

If IDP_DET_LD *(R1+R2//R3) ≥ VEN_DP_STR_LD, a

strong dimming pull-down current source is

selected; otherwise, a weak dimming pull-down

current source is selected.

In real application design, the weak/strong

dimming pull-down current selection is related to

the detailed application SPEC.

Figure 17—Weak/strong dimming pull-down

current source selection

Damping Circuit Control

If a leading-edge dimmer or trailing-edge dimmer

is detected, the damping circuit is enabled to limit

the inrush current the moment the dimmer turns

on. If no dimmer is detected, the damping circuit

is disabled by pulling up the damp pin voltage, so

the damping resister is shorted by the damping

MOSFET. The damp pin voltage is pulled up if

MULT

voltage

increases

higher

than

VMULT_DAMP_ON. It is pulled down when MULT

voltage decreases lower than VMULT_DAMP_OFF. The

maximum pull-up current source is 100 μA while

the maximum pull-down current source is 400 μA.

Color Temperature and Brightness Control

for Warm Sunset Dimming application

The color temperature and brightness control

circuit is shown in Figure 18.

Figure 18—Color temperature and brightness

control circuit

DIM of MP4060 outputs a driving signal for the

external MOSFET. The DIM control logic is

shown in Figure 19.

Figure 19—DIM signal logic

The DIM turn-on signal is the compliment signal

of the dimming turn-on signal. This means the

longer the dimming turn-on cycle, the smaller the

DIM turn-on cycle. The DIM stays low and the

output current flows only through the 1st LED

string when the dimming turn-on cycle is greater

than 70 percent. As the dimming turn-on cycle

decreases,

the

DIM

turn-on

duty

cycle

proportionally increases the current in the 2nd

LED string. The total current through the 1st string

and the 2nd string remains constant. This current

balance

achieves

color

temperature

and

brightness control. The maximum current through

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